diff options
| author |   Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | 2006-09-19 12:52:50 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@sunset.davemloft.net> | 2006-09-22 15:19:05 -0700 |
| commit | 1ef9696c909060ccdae3ade245ca88692b49285b (patch) | |
| tree | 3a2df5bbd6b448a4f873125ab5dd7c7a0cc7ae05 /net/ipv4/tcp_input.c | |
| parent | [SELINUX]: Fix bug in security_sid_mls_copy (diff) | |
| download | linux-dev-1ef9696c909060ccdae3ade245ca88692b49285b.tar.xz linux-dev-1ef9696c909060ccdae3ade245ca88692b49285b.zip | |
[TCP]: Send ACKs each 2nd received segment.
It does not affect either mss-sized connections (obviously) or
connections controlled by Nagle (because there is only one small
segment in flight).
The idea is to record the fact that a small segment arrives on a
connection, where one small segment has already been received and
still not-ACKed. In this case ACK is forced after tcp_recvmsg() drains
receive buffer.
In other words, it is a "soft" each-2nd-segment ACK, which is enough
to preserve ACK clock even when ABC is enabled.
Signed-off-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_input.c')
| -rw-r--r-- | net/ipv4/tcp_input.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 511b738f118a..b3def0df14fb 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -156,6 +156,8 @@ static void tcp_measure_rcv_mss(struct sock *sk, return; } } + if (icsk->icsk_ack.pending & ICSK_ACK_PUSHED) + icsk->icsk_ack.pending |= ICSK_ACK_PUSHED2; icsk->icsk_ack.pending |= ICSK_ACK_PUSHED; } } |